20mm Hole Punched Vial Seals, Red, Bag 1000

For serum vials with a 13mm hole opening and 20mm outer top rim diameter. Seal perforation is already punched through leaving a smooth opening to expose an underlying stopper (sold separately on this website). This size of vial seal is typical for most serum vials ranging from 5mL to 200mL (exceptions exist - please measure your vial OUTER top diameter first).